sludge gravity belt thickener wwtp Mineral Processing EPCFeb 24, 20180183;32;Saving electricity sludge dewatering machine in Brewery. In Brewery Wastewater Treatment,Sludge Dewatering Machine,Wastewater . that serves two functions, thickening and dewatering in the single machinery. . area as compared to other methods, and the sludge is instantly thickened by gravity. . is about 1/115th of belt press and about 1/12th of conventional screw press.